Selective control mechanism for radio sets



May 25, 1937. R. 1.. GALINAT SELECTIVE CONTROL MECHANISM FOR RADIO SETS Filed Feb. 25, 1935 5 Sheets-Sheet 1 I amen WM fiarz om L. Gcz/z'nczz Mom May 25, 1937. R. L. GALINAT 2,031,295

SELECTIYE CONTROL MECHANISM FOR RADIO SETS Filed Feb. 25, 19:55 SSheetS-Sheet 2 gwc/wkw ansom Gaiz'naz May 7- R. GALINAT 2,081,295

SELECTIVE CONTROL MECHANISM FOR RADIO SETS 5 Sheets-Sheet 3 Filed Feb. 25, 1955 May 25, 1937.

R. L. GALINAT SELECTIVE CONTROL MECHANISM FOR RADIO SETS Filed Feb. 25, 1935 INSULAT/O/V 5 Sheets-Sheet 4 MW? l May 25, 1937. R. GALINAT A snwcwzvm CONTROL MECHANISM FOR RADIO- SETS Filed Feb. 25, 19:55 5 Sheets-Sheet 5 Ransom L. Ga lz'rzczz MW? M Patented May 25, 1937 ssmo'rrva' co m'nor. mscnmsu won more ss'rs Ransom n can Wethersileld, Conn. Application February 25,1935, Serial No. 1,901

sacrum. (01. 250-20) This .invention relates generally to 'means whereby radio sets may be selectively controlled in an automatic manner.

An aim of the invention isto provide an improved and simplified arrangement by means of which radio receiving sets may be automatically dialed or tuned in to receive programs from dii-- ferent transmitting stations at any predetermined or selected time of day and forany predetermined length of time. I

an improved arrangement by means oiwhich various stations may be automatically and selectively tuned in, and the volume with which the several programs are reproduced by the .set may be selectively and automatically controlled.

A still further aim of the .invention is to prom) Another object of the invention istoprovid'e an improved selective station. control mechanism.

wherein a more positive and accurate timing of the receiving set may behad, and disturbances or interferences are minimized. v

Another object of the invention is to provide easily and conveniently adjusted without particular skill or knowledge in order to vary. at will,

40 the transmitting stations fromwhich it is de-' sired to selectively and automatically receivepro-u grams. l l l A still further .aim of theinvention is to provide an improved selective station, control and volume control mechanism which can be moor-- porated into any of the present'day sets without any considerable change in the present design or large additional cost in manufacture; or which can bemade as a separate unit for attachment to a set already manufactured.

More particularly, anaim of-the invention'is to provide certain improvements in the selective control mechanism for radio sets disclosed in the copending application of James H. Denison, de-

55 ceased, Serial No. 694,980 filed O'ctober 2nd 1933r A further aim of the-invention is to providesort and, therefore, is shown only in part and more an improved selective station control mechanism of the character described which may be very.

-. ually set by the usual knob Other objects will be in part obvious and in part pointed out more in detail hereinafter.-

The invention accordingly consists in the teaftures of construction, combination of elements and arrangement oi parts which will be exemplifled in the construction hereinafter set forth and. the scope oi! the application of which will be indicated in the appended claims. a

In the accompanying drawings, wherein I have shown, for illustrative purposes,,one embodiment which the present invention may take:

F ure 1 is a rear elevational view showing the time mechanism in dotted lines, the selector plate or control dial, and the associated switches;

Fig. 2 is a} top plan view of what is shown in Fig. 1;

v Fig. 31s a front view 01' the clock and associated selector plate; 5

Fig. 4 is an enlarged view-showing the operating meansfor the tuning shaft;

Fig. 5 is a sectional view taken substantially on line 5-5 of Fig. 4 with parts broken away;

or less diagrammatically in the drawings. The set may have a tuning device of any suitable type, the tuning device in the present instance being shown in Figme as having the form of a condenser i0 associated with the usual dial shait' i l carrying a dial II. The dial shaft may be manli associated with the dial through a flexible belt 14.

The apparatus maybe provided with a cloclrdriven station selector means such as disclosed in said James H. Denison application. In the accompanying drawings, the clock is designated. generally by the letter B, It may be of the electric type .'(the motor, 'however, not being shown) and it has theusual train of gears leading to a minute shaft l5. vJournaled upon the minute shaft is the usual hour sleeve l6 upon which is mounted for rotation a unit including a sleeve ii, a gear i8, and a selector plate IS.

.The' gear 18 is connected up to the hour sleeve in 55 V hour: that is to say, the openingsare spaced apart so as to represent time intervals of ilfteen minutes 7 such manner that the selector plate is rotated once in twenty-four hours, for example.

The selector plate It rality ofv concentric rows or circles of openings "a, Nb, and "c which are adapted to receive p s: or pins 24. The openings in each row may be suitably spaced apart, depending upon the time'interval during which it is desirable that the programs be played. in the present instance the spacing being such that there are four openings to each portion ofthe plate which represents an each. The selector dial is provided with suitable numerals II and associated scale marks 20. The

numerals run from one to twelve and represent the twenty-four hours of the day. By preference, one-half oi the face of the selector plate is darker than the other half (as represented by shading in the drawings) so as to diiferentiate the day and night periods. Each circle or row of openings corresponds to a sending station. In the present instance, there are three rows of openings but, obviously, the number of rows may be varied as desired.

Selectively associated-with the rows of openings are suitable automatic tuning -control switches "a, "b, and Ilc which are here shown for illimtrative purposes as being in the formof mercury switches. Each of these switches comprises a tube including a globule of mercury adapted to close contact between two terminals ll extending into one end of the tube. Paired with these tuning control switches are set control switches Ila, 32b, .and tie which are also preferably in the form of mercury switches each having a pair oi ,terminals 18. Each pair of switches is carried by a respective rocker or holder at pivoted as at 8'. Associated with each holder isa lever 80 pivoted, as at one end to the holder by a spring 3|. The arrangement is such that when the left-hand end. of a lever is depressed, as shown in switches carried by the respective holder are on. When the lever is rocked clockwise, the switches will be thrown into oi! position with a snap movement because oi the spring It. The several levers it are respectively connected to operating levers a, b, and c.

The pivots for these levers are indicated at 4|.

The operating levers are respectively associated with the carried by the circles of openings 1 l l lll in the selector plate. In the present instance, as will be seen most clear-Ly from Fig. 1, each op-' erating lever has, at its free end. 42 against which the pin orpins dated row of openings is or are adapted Won rotation of the selector plate. The selector plate rotates in a counterclockwise direction in I'll. 3 and in a clockwise direction in Fig. l. The length of each cam portion towipe such that the stud or plug en aging the same will .trolswitches maintain the associated switches in 'closed position for a predetermined period of time, in the present instance ni'teen minutes. The .operating levers a, lb, and lie are provided with oounterweights It which normally urge the mercury switches into oif positions.

In accordance with the present invention, I provide an improved andnovel arrangement of electromagnets through which the tuning coneifect setting of the tuning means: that is, setting of the dial-shaft II and the condenser II to predetermined relative positions. As rdescribed moremde sitthltinis provided with a plul1, and connected at Fig. 1, the

by links-ll a cam porti -.nected to a-lever II by a spring ll.

2|oftheasso-- I! is substantially,

proved arrangement permits of. operation on' relatively low voltages and materially improves the accuracy and nicety with which the tuning is eifected. In the present instance, I have shown pairs of electromagnets respectively associated with the tuning control switches Illa, b, and the, the electromagnets of the several pairs being conveniently designated by the characters a, hand 0. Each of these electromagnets may have a solenoid or coil II and an armature II. The coil may be positioned about a sleeve 41 in which the armature 40 operates. The sleeve may be fixed at its lower end to a base plate II. The electromagnets 0! each pair are positioned side by side and preferably to opposite sides 0! a vertical plane passing through the axis of the shaft H. The several pairs of magnets are positioned one behind the other; that is, they are spaced apart longitudinally of the shaft. Ashereinafter described more in detail, the several electromagnets are vertically adjustable in order to set the apparatus to automatically receive programs from various sending stations. In any adjusted position of the electromagnets, the electromagnets of one pair are diiferentially positioned with shown in Fig. 5, the chains II are connected to the levers by pivoted links II, and the lower ends of the chains are adjustably connected to the armatures by memo! screws II. The adjustment is such that when the coils of any pair are energized the -armatures ofthat pair will be -.drawn down and substantiallly bottomed against the plates it and the chains will be in taut con-'- dition.

I i In order to insure that the programs will be tuned in exactly at the correct time, say at the quarter hour, irrespective, of slight inaccuracies in the cam surfaces 42 and the plugs 24, a master switch I is provided,and this switch is operated mechanically from the' clock mechanism. This switch is preferably in the form of a mercury tube having a; pair of terminals ll. The mercury tube is carried by a holder 84' which is conjt cooperates with a cam II which is driven 4 through suitable gears associated with the clock mechanism so that the cam will make one compleie revolution every fifteen minutes. or other selected predetermined time. This master switch is of advantage in that it reduces to a minimum the length of time that the current-is on the automatic. control mechanism. Thus, it results in a saving or the amount of electricity used and it minimizes noises such as may result from trans former hum or faulty contacts. Also, since it limits the current on the several connect-ions to extremely short periods, failure of the several instrumentalities, such as the switches and transformers, is greatly minimized. .The switch thus has a safety factor. The manner. in which the several instrumentalities so far described are electrically connected The lever up'will now be briefly stated. particular reference being had to Fig. 7. In this ilgure, the feed 4O shown in Fig. 3, in the opening adjacent the in that position. This may be more readily understood by reference to Fig. 5a wherein the sevlines or lead wires are designated by the lever will cause .60 and ii. The set is'connectedto theseiines in K to be thrown oi!r when 1 o'clock arrives, the 1 o'clock plug associated with the circle of openings 7 no will engage the lever 40b, thereby throwing the usual way, and the motor of the clock may be connected across the lines. Manually operable switches 62, 63, and Bi serve the purpose of placing the receiving set under manual or automatic control. The switch, is positioned in the line which leads to the set. The switch "is included in a wire "leading from one of the lines, in the present instance the line 6 I, to corresponding terminals of the set control switches 32a, 82b, and 320. The other terminals of these switches are connected by wires 68 to the line I between the set and the switch 62. The master switch 54 and the switch M are included in a wire 81 leading from the line 80 to the primary coil of a transformer T, the otherend bf the coil being connected by a wire 68 to the other line 8i. The secondary coil of the transformer is connected by wires 69 to one terminal ll of each oithe tuning control switches 39a. illb, and 300. The other terminals of these switches-are respectively and individually connected to the coils of the several Y pairs of electromagnets by wires 10a, 10b, and

100. All of the coils of the electromagnets are 7 connected to the other end of the secondary winding of the transformer by a wire I l. The trans- Fig. '1,

former is of the step-.down type so that the tuning control switches and electromagnets .will operate on a lower voltage than will the radio set.

Byway of example, if the radio set operates on' 110 volts, the transformer may be such as to step the voltage down to 16 volts, as indicated in The operation of the mechanism so far described is briefly as follows: assuming that the outer row of openings 23av of the selector-plate represents one station, say WTIC, and it is desired toautoinatically tune that station in at 12 ocloclr midnight; a plug 24 may be inserted, as

numeral I! which indicates midnight. Assuming that the center'circle of openings 23!) represents WJZ, and it is desired to bring that station in at 1 o'clock in thernorning, a plug 24 will be in-- serted in the 1 o'clock opening of that circle. Assuming further that the inner row of openings 230 represents station WBRI, and it is desiredto tune that station in at 1:15 in the morning, a plug 26 will be positioned in the 1:l5 opening of that circle. The switch 62 is thrown 053" and the switches 63 and 65 are thrown "011.

Now, when 12 oclock midnight comes around,

I the clock will have rotated the selector plate to a position where the 12 oclock plug engages the cam surface of the lever 40a, whereupon the When the master switch is on, a current will 6 now through the primary of the transformer; and

a current will flow momentarily through the secondary oi the transformer; switch 30a, wire Ilia, electromagnets a, and wire 'l'i. When'the coils of the electromagnets a. are energized, the armatures thereof are drawn down so as to set the tuning device at the selected station which, in this instance, is WTIC. The WTIC program will be played for fifteen minutes, an then at 12:15, the plug will ride oil the cam sur ace of the lever 40a 75 whereupon the weight it associatedwith that pair.

the mercury switches 30b and lib into "on" position. again operate in the manner previously described.

the mercury switches Ila and "a i v '5- At this time, the. master switch will 'The set is now energized through the mercury switch 32b, and the coils of the electromagnets b are momentarily energized so as to set the tuning device to station WJZ. The WJZ program will continue for fifteen'minutes, and at 1 :l5.the 1 o'clock plug associated .with the central series of openings rides oil 'the' cam surface of the lever 40b with the result that the mercury switches 80b and 32b are thrown "oil, thus-breaking the -'circuit through the receiving set. As the l'eclo'ck plug rides out of engagement with the lever 0b.

the 1:15 plug associated with the WEB circle of openings 23c becomes 'eiiectives'o as to tune in station WBR for flfteenminutes. hen WBR. is

tuned in, the set is connected to the lines through the switch 320, and the coils of the electromagnets c are-momentarily energized.

It may be stated here that the features ofproviding electromagnetsarranged'in pairs and op- V erating the same on relatively low voltage are of considerable importa cc and .advantagefin that certain eccnomies i construction and operation are effected, likelihood of failure is reduced, and vmore accurate andnicer tuning is obtained. In general, these teatures'make for greater reliabil- 'ity and effectiveness. Upon energization of any pair of eiectromagnets one of the electromagnets thereof serves to move the tuning shaft and condenser to a predetermined position, and the other electromagnet of that pair serves as a brake, so to speak. the two electromagnets cooperating in such manner as, to prevent overthrow of the shaft and to accurately'position it and hold it which they have when the centralpair or electromagnets Mb has been energized. In this case, it will beobse'rved that the two armatures of the electromagnets 44b are practically bottomed against the base plates 48, 'the chains 68 assoelated with those armatures are taut; and the arms 49 are horizontal. Assuming now that the electromagnets a are energized momentarily, the left-hand armature of that pair is drawn down and bottomed, thereby turning the shaft so that the arms thereon are in the dotted inclined position illustrated in that figure. At the same time that the left-hand armature is drawn'down, the right-hand armature is held down by the flux generated within its coilso that, when both armaturesare practically bottomed, they are exerting an equal force in opposite direc ions on the arm 48 and'therefore the arm will not coverthrown, but it will be accurately brought to the selected position which will give the best reception for theparticular station. The magnets may be operated on a low voltage, thus eliminating the necessity of any automatic throw-oil switches in addition to the'tuningcontrol switches 30a, 30b, and 300 and the master switch,

In accordance with the present invention and in order that the apparatus may be adjusted so This adjusting means may take various as to automatically tune'ln programs from anyforms. In the present instance, I have shown an arrangement wherein the magnets or each pair may be adjusted without requiring adjustment between the several armatures and the arms 0, and without interfering, withthe operation or aii'ecting the adjustment oi the electromagnets of the other pairs. To these ends, each of the base plates 48 may be supported by a respective rod ll slidably fitting in a sleeve 16 carried by a supporting plate 11. plate'l'l is a bracket II to which are pivoted three levers ll, one for each pair or electromagnets. Each lever is provided with elongated slots I. in which operate pins ll projecting laterally from the rods 18. Each lever I! is pivoted, as at 82, midway between its respective pair of rods 1! so that when the lever'is angularly adjusted one the electromagnets is raised and the other electroma'snet is lowered to the same extent that the ilrst one is raised. Associated with each lever is a respective segment it having an arcuate slot 04 through which extends a clamping screw it carried by the outer end of the lever II. The face ot-the segment may bear a scale to indicate the stations or wave lengths, the indicia being omitted in the present instance although the scale marks are illustrated. With this arrangement, when it is desired to adiustany pair of electromagnets (as. for example, it it is desired to adjust the electromagnets a so as to automatically bring in station WEAF instead of WTIC) the screw II is loosened, the lever It, is adjusted until the indicating mark on the lever has been brought into registry with the scale mark which indicates WP, and then the screw is tightened up to secure thelever in that position. This operation may be very easily carried out by unskilled persons not familiar with the intricacies or theory or radio. 1

Furthermore, in accordance with the present invention. I provide. in connection with the station selecting means, means of a-very simple and eflective character for automatically controlling the volume with which the programs sent out a from the several stations are reproduced by the radio set. This volume control will now be described, particular reference being had to Figs. 4, 5, and 7. Respectively associatedwith and operated by the pairs oi electromagnets are volume selector switches "a, "b, and lie so arranged that'when a given pair oi electromagnets has been energised to bring in a certain station, the switch associated therewith is closed while the other two switches are open. Each switch may comprise a circuit closing member Ii the opposite ends or which are connected to the ends or a respective lever II by insulating members l2.

Each circuit closing member has s pair of contacts II which, in the present instance, are adiustable in unison with the electromagnets when the latter are adjusted to change the stations to be automatically received. In the present instance there is secured to each base plate an upright rod ll, and'the contacts II are carried by the upper ends or these rods in an insulated manner, as illustrated. Each pair of contacts is positioned relative to the contacts or the other pairs in the same manner as the several pairs o! electromagnets are relatively positioned. The contacts II are preierably in the form of strips oi thin resilient metal bent into generally U- shaped form, as illustrated. The manner in which these switches are connected up to the radio set is diagrammatically shown in Fig. 7. The numeral "designates the circuit oi'the radio Attached to this set which includes a speaker or transformer and the usual manually operable volume control or rheostat l! with which sets are "ordinarily provided. The contacts 98 stone side may be connected by a common wire ll to the circuit II to 5 one side or the rheostat it. The contacts I! at the other side are independently connected by wires "a, lib, and Slc to the circuit II to the other side of the rheostat ll. Interposed in each oi the wires is a respective manually operable volume control orrheostat. These rhecstats are respectively designated by the numerals a, lib,

In describing. the operation oi the. selective volume control, it'will be assumed, for convenience. that the mechanism has been set to bring in stations W'IIC, WJZ, and W'BR. at the times rei'erred to in the description of the operation of the selective station control. The user 01 the .machine, knowing from past experience ,or byexperiment what the setting or rheostat "a should be for station WTIC, for example, will manually set that rheostat so that the sound output of the radio set when reproducing a W'I'IC program will be of the desired volume. Likewise, he will set the rheostat "b 'to suit the characteristics of station WJZ andrheostat lie to suit station WIBR. When station WIIC is automatically brought in at midnight, the electromagnets a move the shaft H so that the arms thereof are in the inclined position, shown by broken lines in Fig. 5. The circuit closing member ll oi the volume selector switch "a will close the circuit between the two contacts 93 of that switch so that the rheostat "a is in the audio circuit. When station WJZ is subsequently brought in, the central of electromagnets bring the arms I to a horizontal position and the switch llb is closed, as shown by full lines in Pig. 5. The audio circuit is now through rheostat "b. When WBR is automatically tuned in, the tuning shaft is brought to a position where the arms thereon are inclined. as indicated by the line 3-4:: oi! Fig. 5, whereupon the switch Ole is closed and the audio circuit is now through rheostat llc.

Further, in accordance with the present invention, I provide an improved arrangement whereby the apparatus may be employed to automatically dial or tune in programs from diirerent transmitting stations transmitted either over short or long wave bands. It is usual to provide present day sets with a manually perable switch where by the set may be tuned into either short or long wave bands. In Fig. '7, I have shown this switch diagrammatically, the same being indiat I" and having at one end three cams ill generally similar to the cams onthe levers "a, 40b, and "c and respectively positioned behind those cams. The several cams III are respectively associated with the rows of openings 28, Ilb, and "c in the IGIQCtOI dll- Connected to sperms the other end. of a, lever m by of a link I9 is a pivoted holder I ll. Mounted on till! holder'is a mercury switch H which comprises a contacts Ill. As shown in Fig. 7, there is fixed to the spindle oi the switch "it a lever lit the 15 Y of the switch Ill.

glass tube provided at one end with a pair of contacts 112 and at its other end with a pair of opposite ends of whichare connected by chains II! to armatures within the solenoids H6 and H1. 10

The solenoid H6 is connected in a circuit which includes the secondary winding the transformer and the contacts 2. ,The other electroniagnet i I1 is in a circuit which includes the secondary oi the transformer and the contacts III Now assuming, that it is desired to bring in a program from a short wave station, station WBX,

for example, at a certain time say 2 o'clock A.M., there is positioned in the 2 AM. hole of that series which represents station WBX, a stud 2 which is long enough to engage the cam I08 which is associated with that particular set'oi openings. When, 2 oclockcomes around, that pin 240 will engagethe associated cams I08 and 42 so that the set will be turned on, the tuning device will be operated in the manner heretoiore described, and a j the wave band switch ill! will be operated so as to change the set into a short wavereceiver. ii

the switch ID! has not already been set to that position. More particularly, assuming that the switch H0 is in the position shown in Fig. 1 and the switch i0! is in the' long wave position shown in Fig. 7,-when the plug 240 operates the lever switch I05 will be moved from the position shown I08, the switch U will be turned-to its other po- "sition so that the circuit is closed between 'the terminals iii. The current will :then flow through the secondary oi the transformer, wire electromagnet is thus energized so that the in Fig. 7 to the short wave position' This action is only momentary becauseoithe master switch 54 which isrelated to the switch III- in thesame manner that itis related to the selector control switches. After the plug 240 rides past the cam Ill,:th e. lever I08 drop back to the position-shown in Pig. 1, thereby bringing the switch ill to the long wave position. The wave band switch Idl will remain in shortwave position until the master "switch is again closed, whereupon a c 8, wire ill, Ill, andwire illwhich includes the coil oi the electromagnet III. This electromagnet is thus energised whereupon the switch "II is brought to the long wav'e position;

shown'in Pig. '1. e

As manychanges could bemadein the above wns'tru'ction and manyapparently widely dii'ier- -ent embodiments o!- the; invention could be made without departing irom the scope thereoi, it is intended that all matter contained in the above description or shown in the accompanying drawings shall beinterpretedasillustrativeandnotin alimitingsense.

It is also to be understood-that thelanguage used in the following claims is intended to cover 1 alloithegeneric andspecinc ieaturesoithe in- 9 language, might be me to an thcrebetween.

.vcntion herein and all statements otthe scope of the invention which, as a matter of y'lclaimasmyinventionz.

L In a selective control mechanism ior sets and .in combination with a tuning device or theset, clock mechanism. station selector means als III, and wire I20 which includes the solenoid oi the electromagnet lid;

t will flow through'the wire apluralityoi said tuning device, the'electromagnets 0! jeach pair being in opposition to each other.

2, In a selective control mechanism ior radio sets and in combination with a tuning device o! the set, said tuning device ha a rotatable member, clock mechanism, stat selector means driven by said clock mechanism and having a plurality oi control elements representing diflerent' stations and adapted to be selectively positioned, a plurality of switches respectively oper ated by said. elements representing the several stations, means automatically maintaining said switches in inoperative positions except when actuatedl by said elements,- a plurality of pairs of electromagnets having movable armatures and having coils respectively associated with said switches sons to be, controlled therethrough, said armatur'es being arranged differentially relative to said rotatable member, and connections be-,

tween the armaturesoi said eiectromagne and said rotatable member, the electromagne to one another. 6 3. 'In a selective control mechanism for radio sets and in combination with a'tuning device of the set having a rotatable member, said tuning device havingcan angularly adjustable member of e'achpair being in opposed and balanced-relation secured to the rotatable member, ciockvme'chanism, station selector means by said clock mechanism and having aplurality of control elements representing diflerent stations and adapted to be selectively positioned, a plurality of switches respectively associated with said elements representing the several stations, a plurality of pairs of electromagnets havingcoils respectively associated with said switches 80 as to be controlled therethrough and having armatures respectively connected, to said rotatable member, and adjust:-

able connections between said a'rmatures and said 1 adjustable member, the electromagnets of each pair being in opposition to one another and being balanced against one another when energised so as to bring and hold said rotatable mber to a predetermined angular position.

4.'In a selective control mechanism for ra sets and in combination with a tuning device 0! the set, said tuning device having a rotatable shaft, clock mechanism, station selector means, a plurality of switches associated therewith, a plurality of pairs oi. electromagnets having movable armatures and having coils respectively-associated with'sald switches so as to be controlled therethrough,,and levers secured 'to said shait' oneior. eachpair' ot'armatures, said pairs of armatures being respectively connected to said levers in opposed and Balanced'relation, and said pairs of electromagnets being diflerentially positioned with'respect to said shait.

,5: In a selective control mechanism for radio sets and in combination with a tuning device of the set, clock mechanism, station selector means driven by said clock mechanism, a plurality or switches associated with said station selector means and representing the several stations, a plurality of pairs oi electroms'gnets respectively associated with said switchesand arranged to diiierentlally adjust said tuning device, the electromagncts or each'pair beingin opposition to each other, and means rapectively associated member, means driven by said clock mechanism and hav- 6 p with each pair or electromagnets for adjustably locating the same in various predetermined positions-to change at will the transmitting stations from which it is desired to selectively receive programs; L

6. In a selective control mechanism for radio sets and in combination with a tuning device of the set, said tuning device having a rotatable member, clock mechanism, station selector means driven by said clock mechanism and having a plurality oi. control elements representing diilerent stations and adapted to be selectively positioned, a plurality of switches respectively associated with said elements representing theseveral stations, a plurality of pairs oi electromagnets having armatures and having coils respectively associated with said switches so as to be controlled therethrough, said electromagnets being arranged to differentially adjust said rotatable member, connections between the arma'tures at said electromagnets and said rotatable member, the electromagnets oi each pair being in opposed and balanced relation to one another, and means respectively associated with each pair 01' elec-' tromagnets for relatively prelocating the same in various selective positions with respect to the shatt without disturbing the balanced and opposed relation 01 the electromagnets.

7. In a selective control mechanism for radio sets and in combination with a tuning device of,

the set, said tuning device having a rotatable member. clock mechanism,, station selector means driven by the clock mechanisms. plurality of switches associated with said station selector means and representing the several stations, a

plurality oi pairs or electromagnets having armatures having coils respectively associated with said switches so as to be controlled therethrough, means for connecting the armatures oi each pair in opposed and balanced relation to said rotatable member, and means for simultaneously adjustabiy positiming to like extents the electromagnets 01 each pair with respect to said rotatable member while maintaining the opposed and balanced relation oi the electromagnets.

8. In a selective control mechanism for radio sets and in combination with a tuning device of the set, clock mechanism, station selector means driven by said clock mechanism, operative devices including electromagnets differentially poing a plurality oi control elements representing diiierent stations and adapted to be selectively positioned, a plurality of t associated with said elements representing the several stations, a plurality of pairs of electromagnets having armatures and having coils-respectively associated ,with'said switches so as to be controlled therethrough the electromagnets 0! each pair being positioned side by side and the electromagnets or one pair being diderens'witches respectively tially positioned with respect to the other pairs.

means for connecting the armatures oi each pair or electromagnets in opposed and balanced relation to said rotatable member, and means associated with each pair or electromagnets for admember while maintaining the balanced and opposed relation oi the electromagnets, said last mentioned means including a lever-pivoted between the electromagnets 01' each pair and con-' nected to the respective electromagnets at like "distances from its pivot. 10. In a selective control mechanism for radio lusting the same with respect to said rotatable plurality of pairs oi selectively positionable electromagnets respectively associated with said switches and ,operatively connected to said tuning device so as to=move the same diflerentially to predetermined positions, a plurality of manually adjustable volume control devices associated with the audio circuit of the set, and volume selector 1* means actuated upon energization of said electromagnets ior selectively connecting said volume controLdevices in the audio circuit of the set. 4

, 11. In a selective control mechanism for radio sets and in combination with a tuning device oi the set, clock mechanism, station selector means driven by said clock mechanism, a plurality of switches associated with said station selector means and representing the several stations, a plurality of pairs of electromagnets respectively associated with said, switches and operatively connected to said tuning device so as to move the same differentially to predetermined positions, a plurality or manually adjustable volume control devices associated with the audio circuit of the set, and. switch means respectively oper-\ ated by each pair oi electromagnets when the tuning operation is eiiected for selectively connecting said volume control devices in the audiocircuit or the set. e

12. In a selective control mechanism for radio sets and in combination with a tuning device of the set, clock mechanism, station selector means driven by said clock mechanism, a plurality oi switches associated with said station selector means and representing the several/stations, a plurality of pairs or electromagnets respectively associated with said switches, each pair being operatively connected to said tuning device so as to move the same diflerentially to a predetermined but adjustable position, a plurality of manually adjustable volume control devices associated with the audio circuit 01' the set, and a plurality of volume selector switches respectively associated with said pairs or electro ets and volume control devices for selectively connecting the latter in the audio circuit of the set.

13. In a selective control mechanism for radio sets'and in combination with a tuning device 0! the set, clock mechanism, station selector means driven by said clockmechanlsm, a plurality of switches associated with said station selector means and representing the several stations, a plurality 0! pairs of electromagnets respectively associated with said switches and operatively connected to said tuning device so as to move the same difl'erentlally' to predetermined positions, aplurality of manually adjustable volume control devices associated with the audio circuit Is of the set, volume selector means respectivelv actuated by eachpair of said electromagnets for selectively connecting said volumecontrol devices in the audio circuit of the set, and means for adlusting said electromagnets and volume selector means. 7

14. In a selective control mechanism for radio sets and in combination with a tuningsdevice of the set, said tuning device having a rotatable shaft, clock mechanism',-station sel t r means,

aplurality of switches associated therewith, a

, pluralityof pairs of electromagnets having armatures and having coils respectively associatedwith said switches so as to be controlled there-- 1 through, levers secured to said shaft one for each pair 'of armatures, said pairs of armatures being respectively connected to said levers in opposed and balanced relation and said pairs of electro-' magnets being differentially positioned with respect to said shaft, a plurality of manually adiustable volume control devices associated with the audio circuit of the set, and a plurality of volume selector switches respectively associated said volume control devices. I

15. In a selective control mechanism for radio sets and in combination. with a tuning device of the set, clock mechanism, station selector means 30 driven by said clock mechanism,a plurality of switches associated with said station selector means representing the several stations, a plurality of pairs of electromagnets, each pair being respectively associated with oneof said switches and arranged to diflerentially adjust said tuning device, the electromagnts of each pairbeing in opposed and balanced relation to one another,-

manually operated means respectively associated with each pair of electromagnets for adjustably mitting stationsfrom which it is desired to, se-- lectivelyj receive programs, a plurality of manually adjustable volume control devices associated with the audio circuit of the set, and a plurality" of volume selector switches respectively associated with said electromagnets and respectively connected to said volume control devices, said switches being adjustable in unison with said electromagnets. 16. In a selective control mechanism for radio sets andin combination with a tuning device of the set, said tuning device having a rotatable member, clock mechanism, station selector means driven by said clock mechanism'and having a plurality of control eleinents representingdifl'en ent stations and adapted to be selectively positioned, a plurality of switches respectively asso-l .ciated with said elements representing the several stations, a plurality of pairs of electromagnets having armatures and having coils respectively associated with said switches so as to be controlled therethroughythe electromagnets of each pair being positioned side by side and the electromagnets of one pair being difl'erentially 05 positioned with respect to the other pairs,.a plurality of levers on said rotatable member, means for connecting the armatures of-said pairs of electromagnets to the respective levers in opposed and balanced relation to the rotatable member, means associated with each pair ofelectromag-i nets for adjusting the same with respect to said rotatable member while maintaining the halanced and opposed relation of the electromagnets, a plurality of manually adjustable volume -control devices associatedwith the audio circuit sperms i with said levers and respectively connected to locating the same at will to change the transof the set, and a plurality of wise selector of electromagnets' and respectively associated switches respectively associated with said'pairs with said volume control devices, each of said I last mentioned switches comprising .-a circuit closing member carried byone of the leversand a pair of contacts carried byand-adiustable in unison with saidelectromaanets.

17'. ms selective control mechanism for radio u sets and inrcombination'with the tuning device and the wave band switch of the set; clock mechanism, station selector'means driven by said J clock mechanism and having aplurality of controlelements representing diflerent stations and adapted to be selectively positioned, means respectively associated with said elements representing the several stations and through which said tuning device is moved 'to diilferent predetermined positions, and means controlled by said elements and operatively connected to said wave band switch for moving the latter from one position to another.

18. In a selective control mechanism for radio sets and in combination with the tuning device and. wave band switch ofthe set, clock mechanism, station selector means driven by said clock mechanism and having a plurality of rows of openings, the several rows representing different vstations and the openings of each row representing time intervals, control plugs to be selectively positioned in said openings, a plurality of switches respectively associated-with the rows of said openings and adapted to be operated by the plugs carried thereby;, aplurality of electrically operated operating "means for, said tuning device and respectively associated with said switches so es'to be controlled therethrough and arrangedto move said tuning device to different predetermined positions, a switch associated with and common to the several rows .of openings and adapted to be operated by the plugs carried thereby, and electromagnet. means controlled through said last mentioned switch and operatively connected to said wave band switch for operating the latter. l

19. In a selective control mechanism for radio sets and in combination with a tuning device and wave band switch of the ,set, clock mechanism,

dial means driven thereby and having a plurality of circles of openings, control plugs adapted to be selectively positioned in said openings, a plurality of switches respectively associated with said circles oi" openings, an operative connection between each switch and the control plugs car- -,ried by the respective circle of openings, each of said connections including a pivoted lever having a cam surface of a predetermined length -respectively behind said cam surfaces of said pivoted levers, and electromagnet' means controlled by said additional switch and connected" to said wave band switch for operating the latter.

20. In a selective controlmechanism for radio sets and in combination with atoning device and senting the wave band switch oi the set, clock mechanism, station selector means driven by said clock mechanism and having a plurality of control elements representing different stations and adapted to be selectively positioned, means respectively associated with said'elements reprethe several stations and through which said tuning device is moved to diilerent predetermined positions. means associated with said last mentioned means for controlling the volume output 01' the set, and means controlled by said elements and operatively connected to said wave band switch for moving the latter iromone position to another.

21. In a selective control mechanism i'or'radio sets and in combination-with a tuning device of the set. clock mechanism, station selector means driven by said clock mechanism and having a plurality of rows of openings, the several rows representing different stations and the openings oi each row representing time intervals, control plugs adapted to be selectively positioned in said openings, a plurality of pairs of switches respectively associated with the rows 01' openings and adapted to be operated by the plugs carried thereby, eaclt pair including a set control switch and a tuning control switch, all of said set control switches being electrically connected to said set so that when any one thereof is on", the set is energized, and a plurality oi electromagnets for moving said tuning device to different predetermined positions and respectively associated with said tuning control switches so as to be controlled therethrough.

22. In a selective control mechanism ior radio sets and in combination with a tuning device oi the set, clock mechanism, station selector means driven by said clock mechanism and having a ,plurality of control elements representing dlflerent stations, a plurality ofpalrs of switches respectively associated with said elements representing the several stations, each pair of switches including-a set control switch and a tuning control switch, all 01 said set control switches being electrically connected to the set so that when any one of said switches is on" the set is energized, and when all of said switches are oi! the set is out of circuit, and a plurality of pairs 0! electromagnets respectively associated with said tuning control switches and arranged to diiierentially adjust said tuning device, said electromagnets of each pair being in opposed and balanced relation to one another.

RANSOM L. GALINAT. 

